(A): Average velocity of gas molecules is zero.
(R): Due to random motion of gas molecules, velocities of different molecules cancel cach other.

Options

A. Both (A) and ( R) are true and (R ) is the correct explanation of (A)
B. Both (A) and (R ) are true and (R ) is not the correct explanation of (A)
C. (A) is true but (R ) is false
D. Both (A) and (R ) are false

Answer

A